Single-ingredient oxime removal type low-modulus room-temperature vulcanization neutral silicone weather-resistant sealant and preparation method thereof

A room temperature vulcanization and deoxime-type technology, applied in adhesives, adhesive additives, non-polymer adhesive additives, etc., can solve the problems of increasing elongation, slow surface dry speed, reducing modulus, etc., and achieve high elasticity and elastic recovery rate, good adhesive performance, and high elastic recovery rate

Active Publication Date: 2018-07-20
GUANGZHOU JOINTAS CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN 106833503A "A low-modulus one-component deketoxime type room temperature vulcanized silicone sealant and its preparation method" provides a deketoxime type low modulus silicone sealant, although its modulus is 0.24 ~0.30MPa, which meets the modulus requirements of low-modulus sealants, but the surface-drying speed is slow, between 40-130min, which is not advisable in practical applications; although a small amount of white mineral oil added can play a role Reduce the modulus and increase the elongation, and the amount of white mineral oil is not large, but after the aging of the environment, the white mineral oil will slowly seep out of the sealant and pollute the substrate
The methylvinyl bis(ε-caprolactam-based) silane chain extender and aminooxysilane crosslinking agent used in it have high reactivity, but their sources are limited and expensive, so it is difficult to use them in large quantities in the production process

Method used

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  • Single-ingredient oxime removal type low-modulus room-temperature vulcanization neutral silicone weather-resistant sealant and preparation method thereof
  • Single-ingredient oxime removal type low-modulus room-temperature vulcanization neutral silicone weather-resistant sealant and preparation method thereof
  • Single-ingredient oxime removal type low-modulus room-temperature vulcanization neutral silicone weather-resistant sealant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0048] Preparation of one-component deoxime type low modulus room temperature vulcanization neutral silicone weathering sealant:

[0049] The raw material consumption of embodiment 1~5 is as shown in table 1;

[0050] Reaction conditions are as shown in table 2 in the preparation step of embodiment 1~5;

[0051] Preparation steps:

[0052] S1. Mix α, ω-dihydroxy polydimethylsiloxane, dimethyl silicone oil and chain extender at T1 (℃) temperature and stir for t1 (min), then add light calcium carbonate and heavy calcium carbonate 1. The thixotropic agent is stirred and dehydrated for t2 (min) at T2 (°C) and the vacuum degree is P1 (MPa), and the base material is obtained after cooling;

[0053] S2. At room temperature, add the base material of S1. into a planetary stirring tank, then add a crosslinking agent, a coupling agent and a catalyst, and react t3 (min) at a vacuum degree of P2 (MPa) and a rotational speed of r (rpm). , the one-component room temperature vulcanization ...

Embodiment 5

[0084] The modulus, elastic recovery rate and elongation adhesion of Example 5 all meet the "GB / T 22083-2008 Building Sealants Classification and Requirements" and "GB / T 14683-2017 Silicone and Modified Silicone Building Sealants The performance requirements for low modulus sealants in Adhesives. However, because it uses a conventional small molecule coupling agent as a tackifier, only an intermediate with 3 silanol groups is produced after hydrolysis. When the tensile adhesiveness test was carried out, interfacial failure occurred at an elongation of about 400%, whereas in Example 1, cohesive failure occurred. It shows that the viscosity-increasing effect of oligomer is better than that of small molecule silane coupling agent.

[0085] The test results of Comparative Examples 1-2 and Example 1 show that the base polymer with a viscosity of 50000mPa s has a shorter molecular chain than that of the base polymer with a viscosity of 80000mPa s, resulting in a relatively large cr...

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Abstract

The invention discloses a single-ingredient oxime removal type low-modulus room-temperature vulcanization neutral silicone weather-resistant sealant, which is prepared from the following ingredients in parts by weight: 160 to 240 parts of basic polymers, 30 to 80 parts of light calcium carbonate, 100 to 160 parts of heavy calcium carbonate, 7 to 12 parts of thixotropic agents, 12 to 30 parts of simethicone, 8 to 15 parts of chain expansion agents, 13 to 19 parts of crosslinking agents, 2.5 to 5 parts of coupling agents and 0.2 to 0.4 part of catalysts. The prepared single-ingredient oxime removal type low-modulus room-temperature vulcanization neutral silicone weather-resistant sealant has the advantages of low stretch modulus, high elasticity, high elasticity recovery rate, excellent weather resistance and good bonding performance; after the treatment such as cold pulling-hot pressing and water soaking, the interface bonding damage and cohesive failure cannot occur; the promotion of the high-displacement jointing of the silicone sealant in the super high-rise building and the concrete expansion joint sealing of facilities such as roads, bridges and airfield runway can be facilitated.

Description

technical field [0001] The invention relates to the technical field of polymer sealing materials, in particular to a one-component deoxime-type low modulus room temperature vulcanized neutral silicone weather-resistant sealant and a preparation method thereof. Background technique [0002] Modulus is the ratio of stress to strain in a material under stress. The modulus of fully vulcanized silicone sealant can be divided into three types: high modulus, medium modulus and low modulus. The displacement capacity of low modulus silicone sealant can reach +100 / -50, it has the advantages of large permanent deformation, high elastic recovery rate, excellent adhesion and weather aging resistance, etc. It can be used for super high-rise building joint filling, Sealing of concrete expansion joints of large concrete facilities, roads, bridges, airport runways and other facilities. Due to its high modulus and low tear strength, medium and high modulus silicone sealants are prone to coh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J183/04C09J11/08C09J11/04
CPCC08K2003/265C08K2201/003C08K2201/014C08L2205/025C08L2205/03C09J11/04C09J11/08C09J183/04C08L77/00C08L83/04C08K3/26
Inventor 谢丽莎林坤华石正金余飞
Owner GUANGZHOU JOINTAS CHEM
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